DONE DEAL: Ander Herrera announced the deal with the snap today [Twitter]

Standing next to Sir Bobby Charlton, Herrera can be seen posing with the new kit.

United announced the signing of the Athletic Bilbao midfielder today, revealing he signed on a four-year contract, pending the receipt of an international transfer certificate on their website.

The deal for Herrera needed the Spanish ace to buy-out his own contract, which Athletic Bilbao confirmed he had done earlier today.

A club statement read: "The Football League has certified Athletic Club that player Ander Herrera Agüera has fulfilled the requirements of the applicable regulations valid for unilateral termination of the employment contract that bound him to our Club, by depositing today the amount of compensation established in the contract.

"The Athletic Club thanks Ander Herrera for his dedication during the three seasons he has enjoyed the club and wishes him the best in his future sports projects."